WO2000039703A1 - Procede de synchronisation de plusieurs signaux d'entree numeriques - Google Patents

Procede de synchronisation de plusieurs signaux d'entree numeriques Download PDF

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Publication number
WO2000039703A1
WO2000039703A1 PCT/DE1999/003881 DE9903881W WO0039703A1 WO 2000039703 A1 WO2000039703 A1 WO 2000039703A1 DE 9903881 W DE9903881 W DE 9903881W WO 0039703 A1 WO0039703 A1 WO 0039703A1
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WO
WIPO (PCT)
Prior art keywords
input signals
digital input
digital
signals
sampling
Prior art date
Application number
PCT/DE1999/003881
Other languages
German (de)
English (en)
Inventor
Andreas Jurisch
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to EP99964398A priority Critical patent/EP1141861B1/fr
Priority to DE59902701T priority patent/DE59902701D1/de
Priority to US09/868,773 priority patent/US7327815B1/en
Publication of WO2000039703A1 publication Critical patent/WO2000039703A1/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/17—Function evaluation by approximation methods, e.g. inter- or extrapolation, smoothing, least mean square method

Definitions

  • the invention relates to a method for synchronizing a plurality of .alpha.-digital input signals which are formed by sampling, each with its own work cycle.
  • a method of this type can be found in European patent EP 0 198 684 B1. This is because a differential relay described in this patent works to protect an electrical energy transmission line, which is monitored at various points with regard to the current flowing through.
  • the currents at the various points on the energy transmission line are converted into m digital input signals by sampling, each with its own work cycle, at the various points on the energy supply line to be monitored; the sampling is not carried out at the different points with a synchronous clock, but with slightly different clock frequencies.
  • a digital transmission channel runs between the different points of the energy transmission line, via which a requesting message is transmitted from one acquisition device (master) at one point on the energy supply line to another point, the calling message also containing data that provide an indication of the sampling time at the point in time to give a job.
  • a recording device sends a jerk signal at the other point on the energy transmission line, which includes information about the sampling time in the master and a time difference between the last sampling time in the slave and the subsequent time of receipt of the calling message in the slave. From the jerk signal received by the master, the master concludes that the sampling instants are at different times in the two different points on the power transmission line, and after vector transformation of the received data, the time offset regarding the different sampling instants is compensated for by a corresponding pointer rotation.
  • the invention has for its object to develop a method for synchronizing multiple digital input signals so that it can be carried out comparatively easily and reliably without the need to form pointer sizes.
  • digital auxiliary signals are formed according to the invention in a method of the type specified at the outset by sampling the digital input signals with a common postprocessing clock, a postprocessing clock being used which is at least twice as fast as the slowest working clock; by interpolating each digital auxiliary signal, synchronized digital output signals are formed which correspond to the digital input signals.
  • An essential advantage of the method according to the invention is that it can be used to synchronize several digital input signals even if these input signals are formed from analog input signals by sampling with very different operating cycles.
  • clock generators required to generate the work cycles, only relatively low demands are therefore to be met in order to carry out the method according to the invention.
  • the method according to the invention provides a relatively modest one
  • Another important advantage is that the method according to the invention is relatively simple to carry out, because the sampling of digital input signals with a common postprocessing cycle and the interpolation of the digital auxiliary variables thus formed are common measures in themselves.
  • the method according to the invention can be carried out with sufficient accuracy if the digital input variables are sinusoidal or cosmic signals. This is often not the case, so that relatively large errors have to be accepted. If this is not acceptable in view of the given requirements, then, according to a further development of the invention, it appears advantageous if the digital input signals are filtered before they are sampled with the common postprocessing clock with a filter with a characteristic inverse to the characteristic used for interpolation Interpolation filter. In this embodiment of the method according to the invention, there is a transmission characteristic with the value 1 on the transmission path of the digital input variables until the digital output variables are formed, as a result of which digital output variables can be formed which correspond very precisely to the digital input variables.
  • the digital input signals to be synchronized can be formed very differently. For example, they can be output signals from sensors that emit digital signals at their outputs from analog input variables by means of individual clock generators. Furthermore, the digital input signals can be generated from analog measurement quantities of an electrical energy supply system by scanning at different points in the energy supply system.
  • the method according to the invention is considered to be particularly advantageous if the digital input variables are obtained from secondary variables of transducers in an electrical energy supply system, each of which is sampled with its own work cycle. The transducers know at different positions such. B. be arranged in a substation, or can also be obtained as part of a differential protection arrangement at the ends of an electrical power transmission line or at external connections of a generator or power transformer.
  • the transducers are Rogowski transducers, then the digital input signals formed from the secondary variables of such transducers are converted directly into the digital auxiliary variables, and an integrator is used for interpolation.
  • FIG. 1 shows an exemplary embodiment of an arrangement for carrying out the method according to the invention in the form of a block diagram
  • FIG. 2 shows an exemplary embodiment of a filter for filtering the digital input variables
  • FIG. 3 characteristic and structure of the filter according to FIG. 2,
  • Figure 4 shows an exemplary embodiment of an interpolation filter and in
  • Figure 5 shows the characteristics and structure of the filter of Figure 4.
  • the arrangement shown in FIG. 1 contains a further receiving device 7, which is connected with its input 8 in a manner to a further input 9 of the arrangement, as has been described in connection with the receiving device 6 with reference to the input 8.
  • the dotted representation is intended to include an analog-digital converter corresponding to the analog-digital converter 2, a signal encoder corresponding to the signal encoder 3, a sensor device corresponding to the transmitting device 4 and a transmission channel corresponding to the transmission channel 5.
  • a pulse sequence yd (k ⁇ ) is then obtained, which is obtained from the signal y (t) in accordance with the pulse sequence xd (k).
  • a signal decoder 10 is connected to the receiving devices 6 and 7, which contains a sampling device 11 on the output side.
  • This resampling device 11 can be constructed and operate in the manner as described in detail in US Pat. No. 5,075,880, in particular in FIG. 5, and described in connection therewith.
  • the digital input signals xd (k) and yd (k) are each sampled individually with a common postprocessing cycle of the resampling device, and digital auxiliary signals xd (nk + j) and yd (nk + j) are formed by inserting zero values .
  • the resampling device 11 is designed with regard to its postprocessing cycle in such a way that it is at least twice as fast as the fastest working cycle in the formation of the digital input signals x (k). For example, if the sampling frequencies for obtaining the digital input signals x (k) are between approximately 1 to 40 kHz, then a frequency range between 10 and 500 kHz is required for the postprocessing cycle; 200 kHz is recommended.
  • the digital auxiliary signals xd (n ⁇ + j) and _ / d (nk + j) with a comparatively high postprocessing cycle are each fed to an interpolation filter 12 or 13, which in the exemplary embodiment shown is in each case an integrator. Integrators are used because three differentiators have been used as signal encoders. This results in a transmission characteristic with the value 1 with regard to the functioning of the signal encoder 3 and the integrator 12 of the signal decoder 10. Basically, other interpolations come, ask me, z. B. Lagrange interpolators or Spl me interpolators.
  • the pulse sequences x (nk + j) and y (nk + j) formed at the output of the integrators 12 and 13 are synchronized and are each fed to an anti-alias filter 14 and 15, by means of which the pulse sequences are adjusted to those required for processing in an evaluation device (not shown) Bandwidth can be limited. This results in digital output signals x (m) at the output of one antialism filter 14 and y (m) at the output of the other antialism filter 15. These digital output signals x (m) and y (m) can now be reduced to a sampling rate in a known manner as it is suitable for an evaluation device, not shown. This sampling rate must result from the sampling rate of the resampling device 11 by an integer divider. At the assumed frequencies, useful values are between 0, 6 and 10 kHz for applications in the monitoring of electrical power supply systems.
  • x (t) and y (t) are pure sine or cosine signals, then the signal encoder 3 can be omitted in each case. This also applies to non-pure sine or cosine signals if x (t) and y (t) output variables from Rogowski converters sm ⁇ , we l these output variables correspond to the differential quotient of the converter input variables.
  • FIG. 2 shows an exporter for example for a signal coder 3 according to FIG. 1, which is designed as an FIR filter with the effect of a differentiator.
  • A denotes the input of the signal encoder and B the output. From the digital input signal x (k) the im pulse s follow xd (k).
  • the coefficients a 0 , a_ and bi of the signal encoder 3 are dimensioned as follows:
  • the upper representation in FIG. 3 shows the amplitude curve over the frequency of the signal encoder according to FIG. 2, while the lower representation in FIG. 3 shows the phase curve over the frequency of such a filter.
  • the interpolation device 12 or 13 shown in FIG. 4 according to FIG. 1 shows an FIR filter as an integrator with coefficients a 0 , ai, bi with a dimensioning as can be seen from the table below.
  • C is the input of this FIR filter and D is the output.
  • the amplitude curve is above the frequency of the filter according to FIG. 4 and in the lower representation of FIG. 5 the phase curve is above

Abstract

Procédé de synchronisation de plusieurs signaux d'entrée numériques qui sont formés par échantillonnage avec une cadence de travail propre à chacun. Selon la présente invention, pour mettre en oeuvre un tel procédé de manière fiable et relativement simple, des signaux numériques auxiliaires (xd(nk+j), yd(nk+j)) sont formés par échantillonnage des signaux numériques d'entrée (x(k)) avec une cadence de correction commune. A cet effet est utilisée une cadence de correction qui est au moins deux fois plus rapide que la cadence de travail la plus rapide. L'interpolation de chaque signal numérique auxiliaire (xd(nk+j), yd(nk+j)) permet la formation de signaux de sortie numériques (x(m), y(m)) qui correspondent aux signaux d'entrée numériques (x(k)).
PCT/DE1999/003881 1998-12-23 1999-11-30 Procede de synchronisation de plusieurs signaux d'entree numeriques WO2000039703A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP99964398A EP1141861B1 (fr) 1998-12-23 1999-11-30 Procede de synchronisation de plusieurs signaux d'entree numeriques
DE59902701T DE59902701D1 (de) 1998-12-23 1999-11-30 Verfahren zum synchronisieren von mehreren digitalen eingangssignalen
US09/868,773 US7327815B1 (en) 1998-12-23 1999-11-30 Method for synchronizing several digital input signals

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19860720.2 1998-12-23
DE19860720A DE19860720A1 (de) 1998-12-23 1998-12-23 Verfahren zum Synchronisieren von mehreren digitalen Eingangssignalen

Publications (1)

Publication Number Publication Date
WO2000039703A1 true WO2000039703A1 (fr) 2000-07-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1999/003881 WO2000039703A1 (fr) 1998-12-23 1999-11-30 Procede de synchronisation de plusieurs signaux d'entree numeriques

Country Status (5)

Country Link
US (1) US7327815B1 (fr)
EP (1) EP1141861B1 (fr)
CN (1) CN1129080C (fr)
DE (2) DE19860720A1 (fr)
WO (1) WO2000039703A1 (fr)

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Also Published As

Publication number Publication date
EP1141861A1 (fr) 2001-10-10
DE59902701D1 (de) 2002-10-17
DE19860720A1 (de) 2000-06-29
US7327815B1 (en) 2008-02-05
EP1141861B1 (fr) 2002-09-11
CN1333893A (zh) 2002-01-30
CN1129080C (zh) 2003-11-26

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